Craig:
I would suggest you simply stay with the Airtronics system until
you find that you want to expand to 5 or 6 channel functions. At
that time you should look at the Hitec Eclipse 7 ch. with 7 model
memory. The current price is 275.00 w/ 4 servos. Some dealers
have had it for as low as 235.00 -- I just bought mine for 180.00
for the Tx only from Hobby Horse.